// addEvent/removeEvent written by Dean Edwards, 2005
// with input from Tino Zijdel
// http://dean.edwards.name/weblog/2005/10/add-event/

function addEvent(element, type, handler) {
	// assign each event handler a unique ID
	if (!handler.$$guid) handler.$$guid = addEvent.guid++;
	// create a hash table of event types for the element
	if (!element.events) element.events = {};
	// create a hash table of event handlers for each element/event pair
	var handlers = element.events[type];
	if (!handlers) {
		handlers = element.events[type] = {};
		// store the existing event handler (if there is one)
		if (element["on" + type]) {
			handlers[0] = element["on" + type];
		}
	}
	// store the event handler in the hash table  
	handlers[handler.$$guid] = handler;
	// assign a global event handler to do all the work
	element["on" + type] = handleEvent;
};
// a counter used to create unique IDs
addEvent.guid = 1;

function removeEvent(element, type, handler) {
	// delete the event handler from the hash table
	if (element.events && element.events[type]) {
		delete element.events[type][handler.$$guid];
	}
};

//Added by Chuck Tassoni
function removeEventsOfType(element, type) {
	// delete the event handler from the hash table
	if (element.events && element.events[type]) {
		var handlers = element.events[type]
		for(var i in handlers){
		  	var s = i + " " + handlers[i]
		  	if(i > 0)  //Only delete if this is a handler added by addEvent
		  		delete handlers[i]
		}
      
	}
};

//Here 'this' will  be the element to which the event was attacthed.
function handleEvent(event) {
	var returnValue = true;
	// grab the event object (IE uses a global event object)
	event = event || fixEvent(window.event);
	// get a reference to the hash table of event handlers
	var handlers = this.events[event.type];
	// execute each event handler
	for (var i in handlers) {
		this.$$handleEvent = handlers[i];
		if (this.$$handleEvent(event) === false) {
			returnValue = false;
		}
	}
	return returnValue;
};

function fixEvent(event) {
	// add W3C standard event methods
	event.preventDefault = fixEvent.preventDefault;
	event.stopPropagation = fixEvent.stopPropagation;
	return event;
};
fixEvent.preventDefault = function() {
	this.returnValue = false;
};
fixEvent.stopPropagation = function() {
	this.cancelBubble = true;
};




//Addition --Chuck Tassoni
function addReturnKeyEvent(elemName, action){
        var outerFunc = function(e){
		    if ( e.keyCode == 13) {
		        eval(action)
		        e.preventDefault();

		    }
	      }
	      removeEventsOfType(document.getElementById(elemName), 'keypress')
	      addEvent( document.getElementById(elemName), 'keypress', outerFunc);
}